#include<stdio.h>
#include<unistd.h>
#include<sys/types.h>
int main()
{
    printf("我是一个进程:pid=%d ppid=%d\n",getpid(),getppid());
    pid_t id=fork();
    if(id==0)
    {
        while(1)
        {
          printf("我是子进程:pid=%d ppid=%d\n",getpid(),getppid());
          sleep(1);
        }
    }
    else if(id>0)
    {
        while(1)
        {
          printf("我是父进程:pid=%d ppid=%d\n",getpid(),getppid());
          sleep(1);
        }
    }
    else
    {
        printf("error\n");
    }
    return 0;
}
